Alert archive / Texas / Tornado Watches in 2007

Tornado Watch 182

April 24, 20077 counties in Arkansas; 43 counties in Texas

The Storm Prediction Center issued this tornado watch at Apr 24, 2007, 10:35 PM CDT for 7 counties in Arkansas; 43 counties in Texas. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Apr 24, 2007, 10:35 PM CDT (03:35 UTC)
Expired
Apr 25, 2007, 4:00 AM CDT
In force
5 hr
Issued by
the Storm Prediction Center
Largest hail expected
1 in
Strongest gust expected
70 kt
All 50 counties

Hempstead County, AR, Howard County, AR, Lafayette County, AR, Little River County, AR, Miller County, AR, Nevada County, AR, Sevier County, AR, Anderson County, TX, Bell County, TX, Bosque County, TX, Bowie County, TX, Camp County, TX, Cass County, TX, Cherokee County, TX, Collin County, TX, Coryell County, TX, Delta County, TX, Ellis County, TX, Falls County, TX, Fannin County, TX, Franklin County, TX, Freestone County, TX, Gregg County, TX, Hamilton County, TX, Harrison County, TX, Henderson County, TX, Hill County, TX, Hopkins County, TX, Hunt County, TX, Kaufman County, TX, Lamar County, TX, Lampasas County, TX, Leon County, TX, Limestone County, TX, Marion County, TX, McLennan County, TX, Milam County, TX, Morris County, TX, Nacogdoches County, TX, Navarro County, TX, Rains County, TX, Red River County, TX, Robertson County, TX, Rockwall County, TX, Rusk County, TX, Smith County, TX, Titus County, TX, Upshur County, TX, Van Zandt County, TX, Wood County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 161 km from the middle of the area, began a volume at 03:35 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes
40%
One or more EF2 to EF5 tornadoes
20%
Ten or more severe wind reports
50%
One or more gusts of 65 knots or more
50%
Ten or more severe hail reports
30%
One or more hailstones of 2 inches or more
5%
Six or more combined severe hail and wind reports
80%

Warnings issued inside it

1 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Apr 25, 3:19 AM CDTFlash Flood WarningSHVSmith4 hr

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 3.6 hours before the alert went out and 159 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Fort Worth, TX at 00:00Z on 2007-04-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1510 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Fort Worth, TX at 00:00Z on 2007-04-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 154 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1510 J/kg
Mixed-layer CIN
-21 J/kg
Mixed-layer LCL
701 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
154 m²/s²
0-3 km storm-relative helicity
126 m²/s²
Significant tornado parameter
1.0
Supercell composite
5.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000
WWUS20 KWNS 250336
SEL2  
SPC WW 250336
ARZ000-OKZ000-TXZ000-250900-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 182
NWS STORM PREDICTION CENTER NORMAN OK
1035 PM CDT TUE APR 24 2007

THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF 

       SOUTHWESTERN ARKANSAS
       EXTREME SOUTHEASTERN OKLAHOMA
       CENTRAL THROUGH NORTHEAST TEXAS

EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 1035 PM
UNTIL 400 AM CDT.

TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 80 STATUTE
MILES EAST AND WEST OF A LINE FROM 40 MILES NORTH OF TEXARKANA
ARKANSAS TO 20 MILES SOUTH SOUTHEAST OF TEMPLE TEXAS.  FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU2).

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.

OTHER WATCH INFORMATION...THIS TORNADO WATCH REPLACES TORNADO
WATCH NUMBER 176. WATCH NUMBER 176 WILL NOT BE IN EFFECT AFTER
1035 PM CDT. CONTINUE...WW 180...WW 181...

DISCUSSION...SERIES OF SVR TSTMS -- INCLUDING A FEW BOW ECHOES --
WILL PROCEED EWD ACROSS N-CENTRAL/NERN TX...MCCURTAIN COUNTY OK AND
SWRN AR WITH PRIMARY THREAT BEING SVR GUSTS.  IN ADDITION TO WIND
THREAT...VERTICAL SHEAR PROFILES ARE FAVORABLE FOR A FEW TORNADIC
MESOVORTICES OCCURRING WITH BOWS/LEWPS.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.
MEAN STORM MOTION VECTOR 25040.


...EDWARDS

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 24, 7:33 PM CDTMesoscale DiscussionSPCBenton, Carroll, Clark, Crawford, Franklin, Hempstead and 15 more117 min
Apr 24, 9:10 PM CDTTornado WatchSPCBaxter, Boone, Clark, Cleburne, Conway, Dallas and 26 more4 hr
Apr 24, 10:05 PM CDTMesoscale DiscussionSPCClay, Craighead, Crittenden, Cross, Greene, Jackson and 4 more85 min
Apr 24, 10:07 PM CDTMesoscale DiscussionSPCLittle River, Miller, Sevier83 min
Apr 24, 10:53 PM CDTSevere Thunderstorm WatchSPCClay, Craighead, Greene, Lawrence, Mississippi, Poinsett and 1 more3 hr
Apr 24, 11:58 PM CDTMesoscale DiscussionSPCClark, Dallas, Garland, Grant, Hempstead, Hot Spring and 15 more92 min
Apr 25, 12:45 AM CDTMesoscale DiscussionSPCClay, Craighead, Greene, Lawrence, Mississippi, Poinsett and 2 more90 min
Apr 25, 2:10 AM CDTMesoscale DiscussionSPCColumbia, Union65 min
Apr 25, 12:30 PM CDTMesoscale DiscussionSPCBenton, Carroll, Washington60 min
Apr 25, 1:11 PM CDTSevere Thunderstorm WatchSPCBenton, Carroll8 hr
Apr 25, 2:46 PM CDTMesoscale DiscussionSPCBaxter, Boone, Conway, Crawford, Franklin, Johnson and 12 more59 min
Apr 25, 3:38 PM CDTTornado WatchSPCBaxter, Benton, Boone, Carroll, Cleburne, Conway and 25 more6 hr
Apr 25, 6:15 PM CDTMesoscale DiscussionSPCClark, Columbia, Lafayette, Nevada, Ouachita90 min
Apr 25, 6:38 PM CDTMesoscale DiscussionSPCBaxter, Boone, Cleburne, Conway, Faulkner, Fulton and 17 more97 min
Apr 24, 10:53 PM CDTTornado WatchSPCAtascosa, Bandera, Bastrop, Bexar, Blanco, Burnet and 28 more7 hr
Apr 25, 1:14 AM CDTMesoscale DiscussionSPCAtascosa, Bandera, Bastrop, Bee, Bexar, Blanco and 35 more91 min
Apr 25, 1:40 AM CDTTornado WatchSPCAransas, Austin, Bee, Brazoria, Brazos, Burleson and 30 more7 hr
Apr 25, 4:29 AM CDTMesoscale DiscussionSPCAngelina, Aransas, Austin, Bee, Brazoria, Brazos and 35 more91 min
Apr 25, 7:36 AM CDTMesoscale DiscussionSPCAransas, Austin, Bee, Brazoria, Calhoun, Chambers and 28 more84 min
Apr 25, 9:00 AM CDTMesoscale DiscussionSPCBrazoria, Chambers, Galveston, Hardin, Harris, Jasper and 9 more60 min
Apr 25, 9:13 AM CDTTornado WatchSPCAransas, Brazoria, Calhoun, Chambers, Fort Bend, Galveston and 8 more8 hr
Apr 25, 3:05 PM CDTMesoscale DiscussionSPCGalveston55 min

Nearby

Tornado Watches in Texas, 2007Tornado Watches in Arkansas, 2007Every tornado watch in 2007

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.